Method of tensioning a diaphragm for an electro-dynamic loudspeaker
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a diaphragm and electro-dynamic technology, applied in the field of electro-dynamic loudspeakers, can solve the problems of frame design challenges, use of loudspeakers, and inability to position or orient the desired loudspeakers
Active Publication Date: 2007-10-09
HARMAN INT IND INC
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Problems solved by technology
Many design and manufacturing challenges present themselves in the manufacturing of electro-dynamic loudspeakers.
The frame presents its own design challenges.
Accordingly, designing conductors for electro-dynamic loudspeaker applications presents various challenges such as selecting the speaker with the desired audible output for a given location that will fit within the size and location constraints of the desired applications environment.
Often, space limitations in the listening environment prohibit the use of a loudspeaker in an audio system that possesses the preferred directivity pattern for the system's design.
For example, the amount of space and the particular locations available in a listening environment for locating and / or mounting the loudspeakers of the audio system may prohibit the use of a particular loudspeaker that exhibits the intended directivity pattern.
Also, due to space and location constraints, it may not be possible to position or oriented the desired loudspeaker in a manner consistent with the loudspeaker's directivity pattern.
Consequently, size and space constraints of a particular environment may make it difficult to achieve the desired performance from the audio system.
Unfortunately, the large rectangular size results in a high-frequency beam width angle or coverage that may be too narrow for its intended application.
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[0062]FIG. 1 is a perspective view of an electro-dynamic loudspeaker 100 of the invention. As shown in FIG. 1, the electro-dynamic loudspeaker is a generally planar loudspeaker having a frame 102 with a diaphragm 104 attached in tension to the frame 102. A conductor 106 is positioned on the diaphragm 104. The conductor 106 is shaped in serpentine fashion having a plurality of substantially linear sections (or traces) 108 longitudinally extending along the diaphragm interconnected by radii 110 to form a single current path. Permanent magnets 202 (shown in FIG. 2) are positioned on the frame 102 underneath the diaphragm 104, creating a magnetic field.
[0063]Linear sections 108 are positioned within the flux fields generated by permanent magnets 202. The linear sections 108 carry current in a first direction 112 and are positioned within magnetic flux fields having similar directional polarization. Linear sections 108 of conductor 106 having current flowing in a second direction 114, th...
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Abstract
Electro-dynamic loudspeakers typically include a diaphragm having a conductor applied to one of its surfaces. The diaphragm is secured to a frame. The conductor is connected to a power supply for providing electrical current through linear traces of the conductor that interact with magnetic fields generated by magnets that are mounted to the frame. The diaphragm is driven by a motive force created when current passes through the conductor within the magnetic field. The electrical current is varied to create an acoustical output from the electro-dynamic loudspeaker. Different methods of tensioning the diaphragm are provided for simplifying the manufacturing process and for assuring proper diaphragm tension.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Application No. 60 / 380,001, filed on May 2, 2002; U.S. Provisional Application No. 60 / 378,188, filed on May 6, 2002; and U.S. Provisional Application No. 60 / 391,134, filed on Jun. 24, 2002. The disclosures of the above applications are incorporated herein by reference.[0002]This application incorporates by reference the disclosures of each of the following co-pending applications which have been filed concurrently with this application: U.S. patent application Ser. No. 10 / 428,313, entitled “Mounting Bracket System,” filed May 2, 2003; U.S. patent application Ser. No. 10 / 428,316, entitled “Film Attaching System,” filed May 2, 2003; U.S. patent application Ser. No. 10 / 429,228, entitled “Electrical Connectors for Electro-Dynamic Loudspeakers,” filed May 2, 2003; U.S. patent application Ser. No. 10 / 428,314, entitled “Electro-Dynamic Loudspeaker Mounting System,” filed May 2, 2003; U.S. p...
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